We probably don't talk enough about email design. But with all the email that people get, it matters. Sometimes, an email can have the best content, but it just may be too gray or paragraph-heavy.
Almost all of us have faced a similar situation: We have good content—be it a report, series of articles, newsletter, podcast, webinar—that didn't get the audience it deserved. We can ignore it and hope the insanity doctrine—designing and marketing it the same way and expecting a different result—won't apply to us.